Francis r



(N0 Model.) I

- F. R. HEWITT.

- I NUT-LOCK. No. 248,176. Patented Oct. 11,1881;

ATTORNEYS. V

UNITED STATES PATENT OFFICE.

FRANCIS R. HEWVITT, OF EVINGTON, VIRGINIA, ASSIGNOR TO HIMSELF AN D EDWARD H. VVOODWARD, OF NEW YORK CITY.

NUT-LOCK.

SPECIFICATION forming part of Letters Patent No. 248,176, dated October 11, 1881.

Application filed May 6, 1881. (No model.) i

Virginia, have invented a new and useful Im provement in Nut-Locks, of which the following is a full, clear, and exact description, ref

erence being had to the drawings hereto annexed.

to My invention relates to that class of nutlocks in which a nut is provided with a spring and pin, which are set in its coutactsurface and the latter made to engage with suitable recesses in the washer for holdingthe nut in position.

My improvement consists incertain peculiarities of construction, as hereinafter set forth. In the accompanying drawings, Figure I is a vertical sectional view ot'a rail and fish-plates;

Fig. 2,'a horizontal sectional view of the same, showing the adjustment of the washer; and Fig. 3, a side elevation of the washer, showing lugs for engaging with the perforation in the fish-plate.

The primary object of my invention is to construct a nut-lock which shall be adapted for use in combination with fish-plates having elongated perforations for the bolts to allow for ex,-

'pansion and contraction of the rails. Accord- 0 ingly I provide a washer, A, having two opposite rectangular lugs, a. a, struck up from its central portion on the edge of its central perforation. These lugs, when the washer is placed upon the bolt, are inserted into the elongated sides of the perforation c in the fishplate 0, and thus serve the purpose of preventing the washer from turning when the nut -is screwed down. By such a construction the necessity of providing recesses for lugs upon 40 washers as ordinarily constructed is avoided,

and time'and expense thereby saved. The opposite or outer face of the washer is constructed with the usual ratchet-surface, a, for holding the pin 1), which is closely fitted in a small cy- 5 lindrical seat, I), in the nutB, and preventing the latter from being accidentally unscrewed.

As heretofore constructed, lockingpins which are inserted into the contact-surface of a nut have been made with their projecting pin, since, when the nut is to be removed, the

pin may be easily lifted over the ratchets by inserting a thin blade under it from the outer edge of the washer. An additional advantage is that such a square-headed pin can be made by simply clipping off a piece of wire by the same tool that cuts the spiral coils which are used in connection with the pins. 7

It will be seen that my invention is not only simple in construction and less expensive than most other similar devic s, but also perfectly adapted to accomplish its object;

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, isv

t. In a nut-lock, the ratchet-faced washer A, having two opposite rectangular lugs, to (I,

struck up from its central portion on the edge ofitscentral perforation,substantiallyas shown and described, and for the purpose set forth.

2. In a nut-lock, the ratchet-faced washer A, having two opposite rectangular lugs, a a, on the edge of its central perforation, in combination with the fish-plate 0, having the elongated 8o perforation c, substantially as shown and described, whereby the washer may be'prevented from turning when the nut is appli' d, as set forth.

3. In a nutlock, the combination of nut B, having a. small cylindrical seat, I), in its contact-surt'ace, in which is seated a. spiral springand closely-fitting square-headed pin, 1), the ratchet-faced washer A, having two opposite lugs, a a, on the edge of its central perforation, 0 the fish-plate'O, having elongated perforation c, and a suitable bolt, substantially as shown and described.

FRANorsr. HEWITT.

lVitnesses:

L. D. SoLoMoN, O. FRANK STEWART. 

